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alexgriva [62]
3 years ago
15

Help me with 15 16 17 and 18 please thank you so much

Chemistry
2 answers:
Oksana_A [137]3 years ago
4 0
15.c
16.the law of conservation of mass state that mass in a isolated system is niether created or destroyed.
17.you can prove that dissolving salt is a physical change by evaporating the water to separate the two.
klemol [59]3 years ago
3 0
I Know 15. Answer Is D.
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When 100ml of M HCl is mixed with 100ml of N NaOH, the pH of the resulting solution is
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Answer:

Option d. 7

Explanation:

A mixture of a strong base and a strong acid produce a neutral salt and water.

This is the reaction of neutralization:

HCl + NaOH → NaCl + H₂O

NaCl →  Na⁺  +  Cl⁻

Sodium chloride is neutral salt which does not give H⁻ neither OH⁻ to medium, that's why pH is neutral.

Both ions are derivated from a strong acid and base so they do not make hydrolisis. They are a conjugate pair of a weak acid and base. The reactions can not occur:

Cl⁻  +  H₂O ← OH⁻  +  HCl

Na⁺  +  H₃O⁺ ← NaOH  + H₂O

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As you move from left to right across a period, what happens to the atomic radil?
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Moving Across a Period

Moving from left to right across a period, the atomic radius decreases. The nucleus of the atom gains protons moving from left to right, increasing the positive charge of the nucleus and increasing the attractive force of the nucleus upon the electrons

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3 years ago
Define density of a substance.
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Answer:

density, mass of a unit volume of a material substance. The formula for density is d = M/V, where d is density, M is mass, and V is volume. Density is commonly expressed in units of grams per cubic centimetre. ... Density can also be expressed as kilograms per cubic metre (in metre-kilogram-second or SI units).

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Answer:

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Explanation:

every transition metal atom are responsible for the flame color. Some metal are also confirmed by flame test.

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